{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,4]],"date-time":"2026-10-04T09:29:15Z","timestamp":1791106155763,"version":"4.1.0"},"reference-count":22,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2008,2,14]],"date-time":"2008-02-14T00:00:00Z","timestamp":1202947200000},"content-version":"vor","delay-in-days":958,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Plant Biology"],"published-print":{"date-parts":[[2005,7]]},"abstract":"<jats:p><jats:bold>Abstract: <\/jats:bold> The photosynthetic responses of six species of mature forest trees to long\u2010term exposure to elevated CO<jats:sub>2<\/jats:sub> (<jats:italic>ca.<\/jats:italic> 530 ppm) were determined at the Swiss Canopy Crane (SCC) site near Basel, Switzerland. In the third year of growth in elevated CO<jats:sub>2<\/jats:sub>, using web\u2010FACE technology, net photosynthesis (A<jats:sub>s<\/jats:sub>) in fully sunlit, upper canopy foliage was stimulated by <jats:italic>ca.<\/jats:italic> 40 % compared to ambient controls. This enhancement did not differ from the instantaneous increase in A<jats:sub>5<\/jats:sub> found in ambient\u2010grown leaves that were temporarily measured at elevated CO<jats:sub>2<\/jats:sub>. A complete lack of down\u2010regulation of photosynthesis was found in all species and in both the early and the late growing season. Neither was leaf nitrogen content significantly affected by long\u2010term exposure to elevated CO<jats:sub>2<\/jats:sub>. Our results document a persistent enhancement in leaf level photosynthesis in response to elevated CO<jats:sub>2<\/jats:sub> in mature forest trees over a period of three years. Circumstantial evidence suggests that the additional assimilates feed into large sinks other than stem and shoot growth.<\/jats:p>","DOI":"10.1055\/s-2005-837635","type":"journal-article","created":{"date-parts":[[2005,7,18]],"date-time":"2005-07-18T07:21:54Z","timestamp":1121671314000},"page":"369-374","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":36,"title":["No Down\u2010Regulation of Leaf Photosynthesis in Mature Forest Trees after Three Years of Exposure to Elevated CO<sub>2<\/sub>"],"prefix":"10.1111","volume":"7","author":[{"given":"G.","family":"Zotz","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S.","family":"Pepin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C.","family":"K\u00f6rner","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2008,2,14]]},"reference":[{"key":"e_1_2_1_2_2","doi-asserted-by":"publisher","DOI":"10.1046\/j.1365-3040.2003.01007.x"},{"key":"e_1_2_1_3_2","doi-asserted-by":"publisher","DOI":"10.1007\/s00442-003-1348-7"},{"key":"e_1_2_1_4_2","doi-asserted-by":"publisher","DOI":"10.1007\/s004420050381"},{"key":"e_1_2_1_5_2","doi-asserted-by":"publisher","DOI":"10.1007\/BF00386231"},{"key":"e_1_2_1_6_2","doi-asserted-by":"publisher","DOI":"10.1046\/j.1365-3040.2001.00652.x"},{"key":"e_1_2_1_7_2","volume-title":"Climate Change 2001. 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